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Energy Loss, Velocity Distribution, and Temperature Distribution for a Baffled Cylinder Model

Description: A study has been made of the important principles involved in the operation of a baffle for an engine cylinder and shows that cooling can be improved by 20 percent by using a correctly designed baffle. Such a gain is as effective as a 65 percent increase in pressure drop across the standard baffle, which had a 1/4 inch clearance between baffle and fin tips.
Date: October 1937
Creator: Brevoort, Maurice J.
Partner: UNT Libraries Government Documents Department
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The measurement of air speed in airplanes

Description: Various methods of measuring the air speed of airplanes are described. Particular emphasis is placed on the procedure required to obtain precise measurements of speed by the use of the suspended Pitot-static head or the suspended static head. Typical calibration curves for service installations of Pitot-static heads are shown and the relation between errors in air speed and corresponding errors in observed altitude for such installations is discussed. There is included a brief discussion of var… more
Date: October 1937
Creator: Thompson, F. L.
Partner: UNT Libraries Government Documents Department
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Stability of Structural Members Under Axial Load

Description: "The principles of the Cross method of moment distribution are used to check the stability of structural members under axial load. A brief theoretical treatment of the subject, together with an illustrative problem, is included as well as a discussion of the reduced modulus at high stresses and a set of tables to aid in the solution of practical problems" (p. 1).
Date: October 1937
Creator: Lundquist, Eugene E.
Partner: UNT Libraries Government Documents Department
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Increasing the Strength of Aluminum-Alloy Columns by Prestressing

Description: A series of tests was made in which the column strength of 17ST tubing was increased as much as 50 percent by prestressing the tubing to 40,000 pounds per square inch in compression under conditions of support that prevented column failure at this stress. This prestressing achieves it's beneficial effects entirely by improving the compressive properties of the material, principally the proportional limit.
Date: October 1937
Creator: Holt, M. & Hartman, E. C.
Partner: UNT Libraries Government Documents Department
open access

The Design of Airplane-Engine Superchargers

Description: Report presenting an investigation of the design of airplane engine superchargers, as they are successful for high-altitude flying.
Date: October 1937
Creator: von der Nüll, W.
Partner: UNT Libraries Government Documents Department
open access

Smelting Ores in the Electric Furnace

Description: Report issued by the U.S. Bureau of Mines discussing the electric smelting of nonferrous ores. As stated in the introduction, "it is the purpose of the present paper to survey the technical and economic changes that have taken place and to determine whether electric smelting of nonferrous ores offers any more promise today than 20 years ago" (p. 1). This report includes tables, and illustrations.
Date: October 1937
Creator: Dean, Reginald S. & von Bernewitz, M. W.
Partner: UNT Libraries Government Documents Department
open access

Coal-Mine Explosions in Ohio: 1874-1936

Description: Report issued by the U.S. Bureau of Mines discussing coal mine explosions in Ohio between 1874 and 1936. The number of explosions and fatalities are presented. The causes of mine explosions are discussed as well. This report includes tables.
Date: October 1937
Creator: Owings, C. W.
Partner: UNT Libraries Government Documents Department
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Research and Design Problems Introduced by Increased Power Output

Description: In what follows the question of the number and geometrical arrangement of the cylinders so important in the design of high performance power units will be considered from various points of view. A discussion will be given of the possibilities of the various working processes and an investigation will be made of possible means for improving the continuous operation and take-off performance, particularly the methods of supercharging, increasing the r.p.m., and employing the two-stroke-cycle engin… more
Date: October 1937
Creator: Kurtz, Oskar
Partner: UNT Libraries Government Documents Department
open access

Auto-Ignition and Combustion of Diesel Fuel in a Constant-Volume Bomb

Description: Report presents the results of a study of variations in ignition lag and combustion associated with changes in air temperature and density for a diesel fuel in a constant-volume bomb. The test results have been discussed in terms of engine performance wherever comparisons could be drawn. The most important conclusions drawn from this investigation are: the ignition lag was essentially independent of the injected fuel quantity. Extrapolation of the curves for the fuel used shows that the lag cou… more
Date: October 5, 1937
Creator: Selden, Robert F.
Partner: UNT Libraries Government Documents Department
open access

Comparative Flight and Full-Scale Wind-Tunnel Measurements of the Maximum Lift of an Airplane

Description: "Determinations of the power-off maximum lift of a Fairchild 22 airplane were made in the NACA full-scale wind tunnel and in flight. The results from the two types of test were in satisfactory agreement. It was found that, when the airplane was rotated positively in pitch through the angle of stall at rates of the order of 0.1 degree per second, the maximum lift coefficient was considerably higher than that obtained in the standard tests, in which the forces are measured with the angles of atta… more
Date: October 26, 1937
Creator: Silverstein, Abe; Katzoff, S. & Hootman, James A.
Partner: UNT Libraries Government Documents Department
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Drag of Cylinders of Simple Shapes

Description: "In order to determine the effect of shape, compressibility, and Reynolds number on the drag and critical speed for simple forms, the drag forces on models of various simple geometric cross sections were measured in the NACA 11-inch high-speed wind tunnel. The models were circular, semitubular, elliptical, square, and triangular (isosceles) cylinders. They were tested over a speed range from 5 percent of the speed of sound to a value in excess of the critical speed, corresponding, for each mode… more
Date: October 27, 1937
Creator: Lindsey, W. F.
Partner: UNT Libraries Government Documents Department
open access

The Transition Phase in the Take-Off of an Airplane

Description: Report presents the results of an investigation to determine the character and importance of the transition phase between the ground run and steady climb in the take-off of an airplane and the effects of various factors on this phase and on the air-borne part of the take-off as a whole. The information was obtained from a series of step-by-step integrations, which defined the motion of the airplane during the transition and which were based on data derived from actual take-off tests of a Vervil… more
Date: October 26, 1937
Creator: Wetmore, J. W.
Partner: UNT Libraries Government Documents Department
open access

A Flight Comparison of Conventional Ailerons on a Rectangular Wing and of Conventional and Floating Wing-Tip Ailerons on a Tapered Wing

Description: Report presents the results of flight tests comparing the relative effectiveness of conventional ailerons of the same size on wings of rectangular and tapered plan forms made with a Fairchild 22 airplane. Information is included comparing conventional and floating wing-tip ailerons on a tapered wing. The results showed that the conventional ailerons were somewhat more effective on the tapered than on the rectangular wing. The difference, however, was so small as to be imperceptible to the pilot… more
Date: October 27, 1937
Creator: Soulé, H. A. & Gracey, W.
Partner: UNT Libraries Government Documents Department
open access

The Design of Airplane-Engine Superchargers

Description: Report studying the "underlying principles for the computation and design of airplane engine superchargers" (p. 1). With the forms of superchargers and underlying principles of computation, delivery heads per stage of 7,000 to 8,500 meters (air column) at an effective efficiency, based on the adiabatic process, of 0.7 may be attained, the space and weight requirements being kept within reasonable limits.
Date: October 1937
Creator: von der Nüll, Werner
Partner: UNT Libraries Government Documents Department
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